Insize 3521 Digital Tubular Inside Micrometers
The Insize 3521 Digital Tubular Inside Micrometer series is built for measuring large internal diameters, using a digital micrometer head paired with extension rods to reach across a wide span of bore sizes. Covering ranges from 6"-40" up to 6"-60" (roughly 150-1500mm), the series is designed for industrial and metrology environments where standard inside micrometers can't reach, such as gauging large pipes, cylinders, or bores. Rated IP65 for dust and waterproof protection, each unit features carbide measuring faces and a fine resolution of .00005"/0.001mm, and is supplied complete with setting standards. As the measuring range increases, additional extension rods are supplied to reach the full capacity of each model, making the 3521 series a dependable choice for machine shops, fabrication facilities, and inspection labs that regularly measure large-diameter bores.
Key Features
- 1" travel micrometer head paired with extension rods for large-diameter measurement
- IP65 dust/waterproof rating for reliable performance in demanding shop conditions
- Carbide measuring faces for long-lasting durability and consistent accuracy
- .00005"/0.001mm resolution for fine, easy-to-read digital measurements
- Supplied with setting standards for accurate calibration
- Additional extension rods supplied as range increases to reach full measuring capacity
Specifications
| Specification |
Detail |
| Measurement Ranges Available |
6"-40", 6"-60", 6-80" |
| Resolution |
.00005"/0.001mm |
| Accuracy |
[.00005(3+n+L/2)]", n = number of rods, L = maximum measuring length (inch); (3+n+L/50)µm for metric models |
| Micrometer Head Travel |
1" (25mm metric) |
| Micrometer Head Size |
6"-7" (150-175mm metric) |
| Extension Rod Diameter |
.866" (22mm metric) |
| Extension Rods Included |
Varies by range (e.g., 25mm, 50mm x2, 100mm, 200mm, 400mm for the 3521-1000) |
| Protection Rating |
IP65 (dust/waterproof) |
| Measuring Face Material |
Carbide |
| Button Functions |
On/off, set, mm/inch, ABS/INC |
| Data Output |
Yes, optional data output cable (code 7315-30, 7302-30) |
Items Included
- Insize 3521 digital tubular inside micrometer head in the selected range
- Extension rods (quantity varies by range)
- Setting standards
- Fitted storage case
- Instruction manual
Insize 3521 Digital Tubular Inside Micrometers Data Sheet
